s3-3 Voltage follower(跟随器)( or isolator隔离器) The voltage follower is a circuit in which the output is identical to the input 19x=b D1 D1 ∴U2=U1,0r =1 The controlled-source representation of the voltage follower
§3-3 Voltage follower（跟随器） (or isolator隔离器) The voltage follower is a circuit in which the output is identical to the input. 2 =1 , 1 , 1 2 2 1 1 2 = = = = or x x The controlled-source representation of the voltage follower: − + 1 − + − + 1 2 x − + 1 • − + 2 + + −
The application of the voltage follower R1 R R,+ r R,∥/R L DRI=D U,≠D R1+R2∥R 足1 2 R2 R U R 2 R+r
The application of the voltage follower R o R R R L 1 2 2 2 1 + = = = 1 1 2 2 1 1 2 2 1 + = = + = o L L R o R R R R R R R R L // //
Cascade(级联) of oP-AMP circuits 2 1k 十 U,=2U k -4D
Cascade(级联）of OP-AMP circuits 2 = 21 − = − = − + 1 3 2 4 2